Smart plug



FIG. 1 is a top, front, right-side perspective view of a smart plug;

FIG. 2 is a bottom, back, left-side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left-side view thereof;

FIG. 6 is a right-side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is a bottom, front, right-side perspective view of the smart plug in an opened configuration; and,

FIG. 10 is a left-side view thereof.

The dashed broken lines depict portions of the smart plug that form no part of the claimed design. 

CLAIM The ornamental design for a smart plug, as shown and described. 